Finding the Fourth Proportional to 12,454.51, 17,189.78 and 7,421.68

Step by Step Solution

1. Step 1: Write the proportion equation
   12,454.51 : 17,189.78 = 7,421.68 : x
2. Step 2: Convert to fraction form
   12,454.51/17,189.78 = 7,421.68/x
3. Step 3: Cross multiply
   12,454.51x = 17,189.78 × 7,421.68
4. Step 4: Simplify right side
   12,454.51x = 127,577,009.32
5. Step 5: Solve for x
   x = 127,577,009.32/12,454.51
6. Step 6: Final answer
   x = 10,243.44